I'm upgrading and have an odd question

[Fuzen Kuden]

Im upgradeing to Radeon HD 7770 from a Radeon HD 6450. The question I have is simple what can i expect from this upgrade as a gamer over all? big? or small?

 

[Turtvaiz]

Pretty big. Looking at some quick videos 6450 has 20-30fps on Ultra in BF3 and I have about 50-60 with a 7770.
You can compare the specs here: http://www.game-debate.com/gpu/index.php?gid=1360&gid2=471&compare=radeon-hd-7770-xfx-core-1gb-edition-vs-radeon-hd-6450